At least eight people were injured Friday morning when a tractor-trailer, box truck and bus collided in Sumner, East Pierce fire officials said.
The collision took place about 6 a.m. at Thompson Street and Traffic Avenue when a box truck T-boned a semi.
It was not immediately clear how the bus was involved in the crash.
Crews worked to clean up a diesel fuel spill and tow the wreckage from the area.
Thompson Street was closed at Mount Circle and Traffic Avenue had reduced lanes.
Traffic at the nearby Sounder Station also was affected.